I agree I have a 1.9 A3 with the PD130 engine in it, returns good MPG, would probably be better MPG if it wasn't a Quattro but it's good fun and keeps me amused on the commute.
+1 the 1.9 stuggles a bit in heavier cars like a Passat and the PD engines are decent on mpg but are extremely powerful. My Leon has the PD170 which is mapped to over 200bhp and still gives 50+mpg on a decent run